To find out the relative sizes of these fractions they need to have a common base or denominator. It happens that all denominators divide into 80, so they can all be expressed as eightieths: 63, 44 and 16. To get these numbers just divide each denominator into 80 and multiply the result by the numerator: 63*1, 11*4, 1*16. So the order from greatest to least is 63, 44 and 16, the order they happen to be in anyway.